Wanted: simple shopping cart code and tutorials

[karmafree]

Hey,

Can you guys please post here me some
links on how to develop shopping carts
using Java Server Pages. I'm looking to
develop a very SIMPLE cart that allows
adding, deleting and updating of items
from a catalogue. Nothing too serious,
not a full blown industrial application!
Just for educational purposes only; a
starter's guide or tutorials perhaps.
I would really appreciate some help and
source code if you guys have any.

Thank you,
karmafree.